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Home >> Mitsubishi >> 2010 >> Eclipse L4-2.4L (4G69) >> Repair and Diagnosis >> Heating and Air Conditioning >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Manual A/C Diagnosis >> Symptom Procedures >> Inspection Procedure 4

Inspection Procedure 4

INSPECTION PROCEDURE 4: Blower Fan and Motor do not Turn.


Blower Motor Circuit (Part 1):




Blower Motor Circuit (Part 2):






FUNCTION
The air from the blower fan is cooled or warmed to control the temperature.

PROBABLE CAUSES
- Malfunction of the blower relay
- Malfunction of the blower motor
- Malfunction of the blower switch
- Malfunction of the harness.
- Malfunction of connector.

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check blower motor connector C-116 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is blower motor connector C-116 in good condition?

YES : Go to Step 2.

NO : Repair or replace the connector.

STEP 2. Measure the voltage at blower motor connector C-116.







1. Disconnect blower motor connector C-116, and measure the voltage at the wiring harness side.
2. Turn the ignition switch to the "ON" position.
3. Turn the blower speed selection dial to the "4 (HI)" position.







4. Measure the voltage between terminal 1 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Is the measured voltage approximately 12 volts?

YES : Go to Step 15.

NO : Go to Step 3.

STEP 3. Check blower relay connector C-206 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is blower relay connector C-206 in good condition?

YES : Go to Step 4.

NO : Repair or replace the connector.

STEP 4. Check the blower relay continuity.







Follow the table below to check the blower relay for continuity.







Q: Is the blower relay continuity in good condition?

YES : Go to Step 5.

NO : Replace the blower relay.

STEP 5. Measure the voltage at blower relay connector C-206.







1. Disconnect blower relay connector C-206, and measure the voltage at the junction block side.
2. Turn the ignition switch to the "ON" position.







3. Measure the voltage between terminal 1 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Is the measured voltage approximately 12 volts?

YES : Go to Step 7.

NO : Go to Step 6.

STEP 6. Check the wiring harness between blower relay connector C-206 (terminal 1) and the ignition switch (IG2).







NOTE: Also check junction block connector C-202 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-202 is damaged, repair or replace the connector.

Q: Is the wiring harness between blower relay connector C-206 (terminal 1) and the ignition switch (IG2) in good condition?

YES : It can be assumed that this malfunction is intermittent.

NO : Repair the wiring harness.

STEP 7. Measure the voltage at blower relay connector C-206.







1. Disconnect blower relay connector C-206, and measure the voltage at the junction block side.







2. Measure the voltage between terminal 5 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Is the measured voltage approximately 12 volts?

YES : Go to Step 9.

NO : Go to Step 8.

STEP 8. Check the wiring harness between blower relay connector C-206 (terminal 5) and fusible link (1).










NOTE: Also check intermediate connector C-24 and junction block connector C-204 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-24, junction block connector C-204 is damaged, repair or replace the connector.

Q: Is the wiring harness between blower relay connector C-206 (terminal 5) and fusible link (1) in good condition?

YES : It can be assumed that this malfunction is intermittent.

NO : Repair the wiring harness.

STEP 9. Measure the resistance at blower relay connector C-206.







1. Disconnect blower relay connector C-206, and measure the resistance at the wiring harness side.







2. Measure the resistance value between terminal 3 and ground.
- The measured value should be 2 ohms or less.

Q: Does the measured resistance value correspond with this range?

YES : Go to Step 11.

NO : Go to Step 10.

STEP 10. Check the wiring harness between blower relay connector C-206 (terminal 3) and ground.










NOTE: Also check junction block connector C-215 and joint connector C-01 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-215 and joint connector C-01 is damaged, repair or replace the connector.

Q: Is the wiring harness between blower relay connector C-206 (terminal 3) and ground in good condition?

YES : It can be assumed that this malfunction is intermittent.

NO : Repair the wiring harness.

STEP 11. Check blower switch connector C-12 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is blower switch connector C-12 in good condition?

YES : Go to Step 12.

NO : Repair or replace the connector.

STEP 12. Check the blower switch continuity.







Follow the table below to check the blower switch for continuity.







Q: Is the blower switch continuity in good condition?

YES : Go to Step 13.

NO : Replace the heater control.

STEP 13. Check the wiring harness between blower motor connector C-116 (terminal 1) and blower switch connector C-12 (terminal 5).










Q: Is the wiring harness between blower motor connector C-116 (terminal 1) and blower relay connector C-12 (terminal 5) in good condition?

YES : Go to Step 14.

NO : Repair the wiring harness.

STEP 14. Check the wiring harness between blower switch connector C-12 (terminal 4) and blower relay connector C-206 (terminal 4).










NOTE: Also check junction block connector C-202 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-202 is damaged, repair or replace the connector.

Q: Is the wiring harness between blower switch connector C-12 (terminal 4) and blower relay connector C-206 (terminal 4) in good condition?

YES : It can be assumed that this malfunction is intermittent.

NO : Repair the wiring harness.

STEP 15. Measure the resistance at blower motor connector C-116 in order to the ground circuit to the blower motor.







1. Disconnect blower motor connector C-116, and measure the resistance at the wiring harness side.







2. Measure the resistance value between terminal 2 and ground.

OK: Less than 2 ohms

Q: Does the measured resistance value correspond with this range?

YES : Go to Step 17.

NO : Go to Step 16.

STEP 16. Check the wiring harness between blower motor connector C-116 (terminal 2) and ground.







Q: Is the wiring harness between blower motor connector C-116 (terminal 2) and ground in good condition?

YES : It can be assumed that this malfunction is intermittent.

NO : Repair the wiring harness.

STEP 17. Check the blower fan and motor operation.







When battery voltage is applied between the terminals, check that the motor operates. Also, check that there is no abnormal noise.

Q: Is there any abnormal noise?

YES : It can be assumed that this malfunction is intermittent.

NO : Replace the blower motor.
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